Mental athletes: Commit this to memory. SHARE Nana’s Table What: Stinky Bklyn and One Girl Cookies collaborate with Lunetta for a family-style Sicilian dinner. Fifty bucks for five courses ($70 with wine pairings). Why: Pass the braciole and cassadetti (sweet ricotta-filled turnovers). When: Reserve now for supper Mon., 6 p.m. Where: Lunetta, 116 Smith St., b/t Pacific & Dean Sts., Boerum Hill (718-488-6269) R.S.V.P. to firstname.lastname@example.org. SHOCK Memorizing Championships What: Mnemonic masters recollect a list of 500 numbers, recite a random 50-line poem, and recall the order of a deck of cards. Why: We can’t remember. When: Sat., 9 a.m.-5 p.m. Where: Con Edison Grand Auditorium, 4 Irving Pl., at 14th St. Watch for free. HEAR (and DANCE OFF) Chairlift What: Live performance of synthpop sounds from Brooklyn band of the moment. Plus, Maurice Fulton’s big, chewy disco-house set. Why: Mister Saturday Night aims to please the ladies. When: Sat., 10 p.m.-4 a.m. Where: Santos Party House, 96 Lafayette St., b/t Walker & White Sts. (212-714-4646). Tix online at ticketweb.com. MIX Eyebeam’s Alternate World’s Fair What: A village of multimedia pavilions (fashion, art, high-context performance, weather balloons) for this utopian expo. Juan Maclean and Tim Sweeney provide fanciful soundtrack. Why: Welcomes hackers, anti-Armory types, and Buckminster Fuller’s fan club. When: Party, Fri. & Sat., 9 p.m.-2 a.m. Installation on view, Sat., noon-6 p.m. Where: 540 W. 21st St., b/t Tenth & Eleventh Aves. Ride the party train! Invite friends onto the dance floor. STRETCH The Fierce Club What: Sixty minutes of hard-core strengthening vinyasa in a blissed-out Nolita garage. Why: Rock and roll yoga to “kick your asana.” When: Five-buck classes all weekend. Thurs., 12:30; Fri., 12:30 & 6:30 p.m. After that, check schedule & rates. Where: 269 Elizabeth St., b/t Houston & Prince Sts. EAT Baked by Melissa Cupcakery Window What: Those baby bites stuffed with PB&J, cookie dough, and more have their own little shop to call home. Why: You can easily eat six for $5.50. Share twelve for ten bucks. When: Mon.-Fri., 10 a.m.-7 p.m.; Sat. & Sun., 10 a.m.-6 p.m. Where: Spring St., b/t Broadway and Mercer Sts. (212-842-0220). Fatty Crab Opens Uptown What: Crispy pork, quail egg shooters, short ribs, and Malaysian tea sandwiches you adore now available on the UWS. (Along with outdoor seating when weather permits.) Why: Life aquatic. Dinner, too. When: Tues.-Sun., 5 p.m.-midnight. Where: 2170 Broadway, b/t 76th & 77th Sts. (212-496-2722).